Exchange Server 2010 and Forefront w/ EDGE

We will be migrating from SBS2k3 R2 to a separate Exchange 2010 server, plus separate domain controller running WINDOWS SERVER 2008 R2 and adding FOREFRONT on another server. Do we need to run EDGE to make all of this happen?
If so, would I just need to purchase another EXCHANGE license to run the EDGE SERVER. Also, were would I run the EDGE SERVER(what box).

Any links to info on this would also be helpful.

Thanks for the input...
markwelAsked:
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Keith AlabasterEnterprise ArchitectCommented:
No - deploying the edge service on a separate box is optional. However, it IS required if you want FTMG to use its ability to control the email policy as seen within the FTMG gui.
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panman3Commented:
You could install a separate EDGE server in your DMZ. With Forefront security for Exchange on the EDGE, your mails are scanned in the DMZ before they reach the app-server(s) were the Exchange database resides => so you have an extra layer of protection.

If you happen to already have a Forefront TMG server in place then the Forefront scanner is already integrated into it. You just need the appropriate license to activate it on the TMG server; your mails are then scanned on the firewall itself before they go to DMZ or to internal LAN.

It is certainly neacessary to have additional licenses for each server running an Exchange role. The cost is therefore higher if you separate roles, but the performance, availability and security are increased.

Regards,
Geert
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markwelAuthor Commented:
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